Machine for cutting holes in plates



(No Model.) 2 Sheets-Sheet I.

F. SGHOFP.

MACHINE FOR CUTTING HOLES IN PLATES. No. 450,428. Patented Apr.'14, 1891.

(No Model.)

2 Sheets-Sheet 2. F. SGHOFF. v MACHINE FOR CUTTING HOLES IN PLATES. No. 450,428. Patented Apr, 14, 1891.

n2 seams PEYER! 00., Maw-mum, vupumurau u c the line 1 2, Fig. 1.

UNITED STATES ATENT nFrcEi.

FREDERIO SOl-lOFF, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR CUTTING HOLES IN PLATES.

SPECIFICATION forming part of Letters Patent No. 450,428, dated April 14, 1891.

Application filed May 9, 1890. Serial No. 351,169. (No model.) 7

To all whom it may concern:

Be it known that I, FREDERIO SOHOFF, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Machines for Outting Holes in Plates, of which the following is a specification.

The object of my invention is to cut portholes in the metallic plates used in the construction of vessels, or man-holes in boilerplates. This object I attain in the following manner, reference being had to the accompanying drawings, in which- Figure 1 is a side view of my improved machine for cutting port-holes in metallic plates. Fig. 2 is a plan view. Fig. 3 is a section on Fig. at is a view of the templet, and Fig. 5 of a modification.

A is the main frame of the machine. This frame is formed in the manner shown in Fig.

1,and has feet aa, which bear upon the plate 00 to be out. On the under side of the plate is a cross bar or beam B, having feet b b, which rest upon the under side of the plate directly opposite the feet a a of the frame A. The frame and the cross-beam B are secured together by a bolt 0, which passes through an orifice x in the plate at. This bolt has a head 0, and applied to the opposite end of the bolt is a nut c. The hole :10 is drilled into the plate prior to the application of the machine thereto, the hole being the center of thelarger holes cut by the tool, described hereinafter.

Adapted to bearings on the frame A and to the spindle or bolt 0 is a sleeve D. This sleeve carries a double cross-head E, on which the tool-carriages H are mounted. The hub E of this cross-head has a screw-pin e, which confines the cross-head to the sleeve D. A collar 19 on the tubular shaft or sleeve sustains the weight of the cross-head, relieving the securing-pin e. The shaft is somewhat larger than the bolt, and snugly fitting on the bolt is a collar q, screwed into the tubular shaft, the bolt also passing through a plate a at the top of the frame. After the machine is set up and centered the collarq is unscrewed from the shaft, freeing the bolt from contact with the moving parts, so that the turning of the shaft will not in any way jar or loosen the bolt and allow the frame to slip on the plate. The object of the collar is to center the bolt and 'shaftin the first instance.

On the sleeve D is a worm-wheel F, which meshes with a worm F on the driving-shaft G. This driving-shaft has its bearings in the frame A, and on the outer end of the drivingshaftisaclutch-couplingg,towhich is adapted the coupling of a flexible shaft by which the machine is driven.

The tool-carriage H is of the ordinary construction, having a tool-slide II, on which is mounted the tool h.

The vertical feed-screw .T has a handle or hand-wheel J, on which are pins j, which come in contact with a feed-bar on a slide K, adapted to ways K on the under side of the frame A. The feed-bar is in the form of a screw in the present instance, and can be adjusted independently of the slide, the slide being adjusted on its ways, for a purpose described hereinafter, and secured in its adjusted position by a set-screw 70'. The number of pinsj in the handle J can be increased or diminished in order to obtain the amount of feed desired.

hen the circular holes are to be cut, I adjust the tool-oarriage H to a fixed position by means of the radial feed-screws l, in order to cut differentsized holes. At the same time the slide K, carrying the feed-bar, is adjusted accordingly, so that it will be seen, on the rotation of the cross-head, the tool will cut a circular way in the plate, the tools being fed in the machine automatically by the pinj coming in contact with the feed-bar 7c as the cross-head revolves around its axis. When oval or other odd openings are re quired to be cut, I. mount a templet M, pref erably on brackets N, depending from the frame A.

011 each tool-carriage ll is secured a lug n, which rests against the edge of the templet when the tool-carriage is released from the control of the screw I, by the usual clutching and releasing gear common to metal-cutting machines. Springs S tend to keep the lugs always in contact with the edge of the templet. The templet may be grooved, as shown in Fig. 4, thus dispensing with the springs, and the springs may be placed on other parts of the cross-head without departing from my invention. Thus it will be seen, for instance, that if an oval opening is to be made an oval templet is used, being bolted to the brackets N, the slide K being adjusted accordingly.

It will be understood that my invention can be used not only for cutting holes in vessel-plating, but can be used in cutting openings in metal work in general.

\Vhen it is required to cut rings from metallic plates, one tool-head can be set on a different circular line from the other tool-j stantially as described.

head. Thus the two cuts are made by one operation, or two tools may be mounted on one head.

I claim as my in vention 1. The combination,in machines forcutting holes in plates, of the frame A, having feet adapted to rest on one side of the plate, a beam having feet adapted to rest on the op posite side of the plate, a bolt for securing the frame and beam togethenwith a sleeve, a crosshead carried by said sleeve, a tool-carriage carried by said cross-head, a Worm-wheel on the sleeve, a worm meshing therewith, and a shaft carrying the said Worm and having at its outer end a clutch adapted for engagement with a flexible shaft, substantially as derier K, adapted to slide on the frame A and scribed.

2. The combination of the frame A, adapted to rest on one side of the plate, the beam I3, adapted to rest on the opposite side of the l plate, a bolt passing through the plate and securing the frame and beam together and to the plate, the shaft, a cross-head carried therei by, and a tool-carriage on said cross-head,with a templet controlling the tool-carriage, substantially as described.

The combination,of the frame, the beam,

the cross-head revolves, substantially as described.

c. The combination of the frame A, the beam B, and the bolt 0, adapted to secure the frame and beam to the plate, with a driven tubular shaft mounted in the frame A, a crosshead carried by said shaft, a tool-carriage on said cross-head, with a templet carried by the frame, and a lug on the tool-carriage bearing against said templet, with a spring tending to keepthetool-carriageagainstthetemplet,sub-

The combination, in a machine for cutting holes in plates, of the frame A, having feet (L a, bearing on one side of the plate, a

b am B, having feet bearing on the opposite side of the plate, with a bolt adapted to pass through an orifice in the plate and to secure the frame and beam together and to the plate, a tubular shaft through which the bolt passes, said shaft having its bearings in the frame A, a worm-wheel on said sleeve meshing With a worm on the driving-shaft, a cross-head E, carried by the tubular shaft, tool-carriages on the cross-head, screw-shafts I, engaging withthetoolcarriages,andatool-feedingscrew J, handle J, pinsj on the handle, with a carcarrying a feed-bar for'feeding the tool to its work, substantially as described.

6. The combination of the frame, the central securing-bolt, a tubular shaft carried by said frame, with a collar (1 loose on the bolt and adapted to be secured to the tubular shaft, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERIC SCHOFF. Witnesses:

HENRY HoWsoN, HARRY SMITH. 

